Spring-tooth harrow



(No Model.)

T. R. CRANE. SPRING TOOTH HARROW.

\ No418,502. v Patented D80.31, 1889.

' 6 WITNESSES: INVENTOR:

X BY

ATTORNEY.

' other.

UNITED STATES PATENT OEFIcE.

THOMAS H. CRANE, OF HEATHSVIIJLE, VIRGINIA.

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 418,502, dated December 31,1889.

Application filed May '7, 1889. Serial No. 309,896. (No model.)

To aZZ whom it may concern.-

Be it known that I, THOMAS R. CRANE, a citizen of the United States, residing at Heathsville, in the county of Northumberland and State of Virginia, have invented certain new and useful Improvements in Spring-Tooth I-Iarrows, of which the following is a specification.

This invention relates to spring-tooth har-.

rows; and it consists in the features hereinafter described and claimed.

The invention is illustrated in the accompanying drawings, in which-- Figure 1 is a cross-section of the beam of a harrow-frame and an improved springtooth attached. Fig. 2 is a view of the springtooth point, showing the reverse side to that seen in Fig. 1. Fig. 3 is a horizontal crosssection of the point taken on the line 3 3 of Fig. 2. Figs. 4, 5, and 6 are views of the dragshoe. Fig. 7 is a side view, and shows a modification of the point.

One feature of the invention relates to the point A, which is attached to the end of the spring-tooth B. This point has two sides, one being at an angle with respect to the One side 0 is straight fore and aft and constitutes the landside, and the other side (1 extends from the cutting-edge e diagonally back. This construction and combination of spring-tooth B and a point A, having a straight fore-and-aft side and a diagonal side, is productive of useful results, in that effective work in harrowing is accomplished, while the resistance drag or draftis reduced to a minimum. A point of this kind may be integral with the spring-tooth that is, it may be welded directly and permanently thereto, as in Fig. 7or the point A may be a separate piece attached to the tooth by rivets or bolts f, as shown in Figs.

thus after one end is worn out the other may be utilized.

I attach curved spring-teeth B to the beam H of a harrowframe, so that a portion c' of the curvature of each tooth near its attached part will project below the said beam or be on a plane lower than that of the beam, as shown in Fig. 1. In the present instance, the fastening device j, which may be of any suitable kind, is attached to one of the vertical sides is of the beam in preference to the top or bottom thereof. The end Z of the curved spring-tooth is secured by the device j, and therefrom the tooth curves down, as at i, below the plane of the beam H, and thence up, as at m, over the said beam, and finally down to the point A, which takes into the ground. It will be seen that this combination of beam H and curved spring-tooth B, I

attached thereto, with a portion iof its curvature projecting below the beam, provides that the low curvature 2' of the spring-tooth shall serve as a runner to drag on the surface of the ground, and thereby sustain the beam I-I up from the ground, while the free end of the tooth carries the harrow-point A.

To protect the spring-tooth from abrasion and wear at that part where it serves as a drag, a drag-shoe N is attached. This shoe is curved to suit the curvature of the tooth. It has a top loop or band 0, provided with a set-screw p, and at each side has an upward flange g. It thus fits the tooth, as shown in Fig. 1, and may be adjusted or removed.

' Having described my invention, I claim- 1. A spring-tooth for harrows, having a point A, provided with a straight fore-andaft side 0 and a side d, extending diagonally with respect to said fore-and-aft side.

2. A spring-tooth for harrows, having, in

combination, the curved spring-tooth B and ICO curved spring-tooth attached thereto, with a In testimony whereof I affix my signature in port-ion i of its curvature projecting below the presence of two witnesses.

the said beam, while the free or point end of the tooth located behind the low curvature THOMAS E. CRANE. penetrates the ground, and at protecting drag- \Vitnesses:

shoe adjustably attached to the said 10w JOHN E. MORRIS,

curvature of the spring-tooth. JNO. T. MADDOX. 

